Combined mouthpiece cover and retainer



FIG. 1 is a perspective view of a combined mouthpiece cover and retainer according to my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a combined mouthpiece cover and retainer, as shown and described. 